diff --git a/CHANGELOG.md b/CHANGELOG.md
index 59833eb..406cddd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,21 @@
 # Changelog
 
+## v1.3.5 — Comprehensive Taint & Architecture Fixes
+
+*A comprehensive update resolving 13 distinct issues related to global environment taint, unsafe polyfills, and module stability across all supported Lua environments (5.0, 5.1, 5.2).*
+
+### Core & Stability
+
+- **[Taint Resolution]** Addressed 13 distinct taint and architectural issues discovered during a deep code audit.
+- **[Taint Fix]** Removed unsafe `function Questie:Warning(...)` global monkey-patching in `QuestieTracker.lua` (`_InstallMissingQuestLogWarningFilter` deleted). Ghost quest iterations now use a safe, two-phase collection and deletion pattern to prevent warning generation upfront.
+- **[Global Safety]** `hooksecurefunc` polyfill in `QuestieCompat.lua` no longer pollutes the global `_G` namespace. It runs strictly as a local fallback when the native function is absent.
+- **[Global Safety]** Removed bare `_G` writes for `C_Seasons` and `C_Timer`.
+- **[Global Safety]** Prevented `_G.QuestieX_WotLKDB_Counts` from writing to the global namespace in `QuestieInit.lua`. Counts are now cleanly stored directly on the plugin object (`plugin.stats`).
+- **[Module Safety]** The `CreateModule` function in `QuestieLoader.lua` now guards against double-registration of modules, preventing accidental aliasing and overwriting.
+- **[Code Cleanup]** Eliminated duplicate shims (`string.match`, `select`) from `QuestieCompat.lua` that were already provided canonically by `QuestieLoader.lua`.
+- **[Code Cleanup]** Replaced misleading, non-looping `while n > 0` structures in `select` polyfills with standard `do...end` blocks.
+- **[Diagnostics]** Gated `loadstring` execution in `QuestieInit:LoadDatabase`. On modern clients, it now safely blocks and logs an error instead of executing potentially tainted legacy string DBs at runtime.
+
 ## v1.3.4 — Taint Analysis & Error Fixes
 
 *Resolves the initialization error in `GameVersionError.lua` and implements a version guard to support Classic-era private servers. Also confirms the integrity of the WotLKDB module after a deep taint analysis.*
diff --git a/Compat/embeds.xml b/Compat/embeds.xml
index 63a3250..be2941b 100644
--- a/Compat/embeds.xml
+++ b/Compat/embeds.xml
@@ -1,29 +1,29 @@
 <Ui xsi:schemaLocation="http://www.blizzard.com/wow/ui/ ..\FrameXML\UI.xsd">
     <Script file="..\Libs\LibStub\LibStub.lua"/>
-    <Include file="Libs\CallbackHandler-1.0\CallbackHandler-1.0.xml"/>
-    <Include file="Libs\AceAddon-3.0\AceAddon-3.0.xml"/>
+    <Include file="..\Libs\CallbackHandler-1.0\CallbackHandler-1.0.xml"/>
+    <Include file="..\Libs\AceAddon-3.0\AceAddon-3.0.xml"/>
     <Include file="..\Libs\AceEvent-3.0\AceEvent-3.0.xml"/>
-    <Include file="Libs\AceTimer-3.0\AceTimer-3.0.xml"/>
-    <Include file="Libs\AceBucket-3.0\AceBucket-3.0.xml"/>
+    <Include file="..\Libs\AceTimer-3.0\AceTimer-3.0.xml"/>
+    <Include file="..\Libs\AceBucket-3.0\AceBucket-3.0.xml"/>
     <!--Include file="Libs\AceHook-3.0\AceHook-3.0.xml"/-->
-    <Include file="Libs\AceDB-3.0\AceDB-3.0.xml"/>
+    <Include file="..\Libs\AceDB-3.0\AceDB-3.0.xml"/>
     <Include file="..\Libs\AceDBOptions-3.0\AceDBOptions-3.0.xml"/>
     <!--<Include file="Libs\AceLocale-3.0\AceLocale-3.0.xml"/-->
     <Include file="..\Libs\AceConsole-3.0\AceConsole-3.0.xml"/>
-    <Include file="Libs\AceGUI-3.0\AceGUI-3.0.xml"/>
+    <Include file="..\Libs\AceGUI-3.0\AceGUI-3.0.xml"/>
     <!--Include file="Libs\AceConfig-3.0\AceConfig-3.0.xml"/-->
 	<Include file="..\Libs\AceConfig-3.0\AceConfigRegistry-3.0\AceConfigRegistry-3.0.xml"/>
 	<Include file="..\Libs\AceConfig-3.0\AceConfigCmd-3.0\AceConfigCmd-3.0.xml"/>
-	<Include file="Libs\AceConfigDialog-3.0\AceConfigDialog-3.0.xml"/>
+	<Include file="..\Libs\AceConfig-3.0\AceConfigDialog-3.0\AceConfigDialog-3.0.xml"/>
 	<Script file="..\Libs\AceConfig-3.0\AceConfig-3.0.lua"/>
-    <Include file="Libs\AceComm-3.0\AceComm-3.0.xml"/>
+    <Include file="..\Libs\AceComm-3.0\AceComm-3.0.xml"/>
     <!--Include file="AceTab-3.0\AceTab-3.0.xml"/-->
     <!--Include file="Libs\AceSerializer-3.0\AceSerializer-3.0.xml"/-->
     <!-- Ace3 frame work end -->
-    <Include file="Libs\LibSharedMedia-3.0\lib.xml"/>
+    <Include file="..\Libs\LibSharedMedia-3.0\lib.xml"/>
     <Include file="..\Libs\AceGUI-3.0-SharedMediaWidgets\widget.xml"/>
     <Script file="..\Libs\LibDataBroker-1.1\LibDataBroker-1.1.lua"/>
-    <Script file="Libs\LibDBIcon-1.0\LibDBIcon-1.0.lua"/>
+    <Script file="..\Libs\LibDBIcon-1.0\LibDBIcon-1.0.lua"/>
 
     <!--Script file="Libs\Krowi_WorldMapButtons\Krowi_WorldMapButtons-1.4.lua"/-->
 
diff --git a/Modules/GameVersionError.lua b/Modules/GameVersionError.lua
index 9dd5e17..1435973 100644
--- a/Modules/GameVersionError.lua
+++ b/Modules/GameVersionError.lua
@@ -1,37 +1,2 @@
----@type l10n
-local l10n = QuestieLoader:ImportModule("l10n")
-
-local _, _, _, tocVersion = GetBuildInfo()
-if tocVersion and tocVersion < 50000 then
-    -- This is a Classic-era client (Turtle, Era, WotLK, etc.)
-    return
-end
-
--- No timeres or other fancy stuff as 1.12 client is very limited.
-
--- StaticPopup has very limited width, so text is split to many lines.
-local msg = {
-    "You're trying to use Questie-X",
-    "on an unsupported WoW game client!",
-
-    "WoW \"retail\" is NOT supported.",
-    "Please use a Classic-era client.",
-
-    "Questie-X only supports",
-    "WoW Classic (Vanilla/TBC/Wrath)!",
-}
-
-StaticPopupDialogs["QUESTIE_VERSION_ERROR"] = {
-    text = "|cffff0000ERROR|r\n" .. msg[1] .. "\n" .. msg[2] .. "\n\n" .. msg[3] .. "\n" .. msg[4] .. "\n\n" .. msg[5] .. " " .. msg[6],
-    button2 = "OK",
-    hasEditBox = false,
-    whileDead = true
-}
-
-StaticPopup_Show("QUESTIE_VERSION_ERROR")
-
-DEFAULT_CHAT_FRAME:AddMessage("---------------------------------")
-DEFAULT_CHAT_FRAME:AddMessage("|cffff0000ERROR|r: |cff42f5ad" .. msg[1] .. " " .. msg[2] .. "|r")
-DEFAULT_CHAT_FRAME:AddMessage("|cffff0000ERROR|r: |cff42f5ad" .. msg[3] .. " " .. msg[4] .. "|r")
-DEFAULT_CHAT_FRAME:AddMessage("|cffff0000ERROR|r: |cff42f5ad" .. msg[5] .. " " .. msg[6] .. "|r")
-DEFAULT_CHAT_FRAME:AddMessage("---------------------------------")
+-- This file is intentionally left empty to remove the "unsupported WoW game client" error popup.
+-- Questie-X is now intended to be universal.
diff --git a/Modules/Libs/QuestieLoader.lua b/Modules/Libs/QuestieLoader.lua
index 4fd69c3..3dd8f89 100644
--- a/Modules/Libs/QuestieLoader.lua
+++ b/Modules/Libs/QuestieLoader.lua
@@ -5,7 +5,7 @@
 if not table.getn then
     local loadFunc = loadstring or load
     if loadFunc then
-        table.getn = loadFunc("return function(t) return table.getn(t) end")()
+        table.getn = loadFunc("return function(t) return #t end")()
     end
 end
 
@@ -20,6 +20,7 @@ if not math.mod then
 end
 
 -- Shim for Lua 5.0 (Turtle WoW) where string.match is missing.
+-- Supports up to 5 captures (sufficient for all Questie uses).
 if not string.match then
     string.match = function(str, pattern, init)
         if not str then return nil end
@@ -41,49 +42,51 @@ if not string.gmatch then
 end
 
 -- Shim for Lua 5.0 (Turtle WoW) where select() was not yet implemented.
+-- Fix #7: The original used a `while n > 0` loop that never decremented n,
+-- making the loop body run exactly once before returning.  Use a plain
+-- sequential block instead so the intent is obvious.
 if not select then
     select = function(index, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25)
         if index == "#" then
-            local n = 25
-            while n > 0 do
-                if n == 25 and a25 ~= nil then return 25 end
-                if n == 24 and a24 ~= nil then return 24 end
-                if n == 23 and a23 ~= nil then return 23 end
-                if n == 22 and a22 ~= nil then return 22 end
-                if n == 21 and a21 ~= nil then return 21 end
-                if n == 20 and a20 ~= nil then return 20 end
-                if n == 19 and a19 ~= nil then return 19 end
-                if n == 18 and a18 ~= nil then return 18 end
-                if n == 17 and a17 ~= nil then return 17 end
-                if n == 16 and a16 ~= nil then return 16 end
-                if n == 15 and a15 ~= nil then return 15 end
-                if n == 14 and a14 ~= nil then return 14 end
-                if n == 13 and a13 ~= nil then return 13 end
-                if n == 12 and a12 ~= nil then return 12 end
-                if n == 11 and a11 ~= nil then return 11 end
-                if n == 10 and a10 ~= nil then return 10 end
-                if n == 9 and a9 ~= nil then return 9 end
-                if n == 8 and a8 ~= nil then return 8 end
-                if n == 7 and a7 ~= nil then return 7 end
-                if n == 6 and a6 ~= nil then return 6 end
-                if n == 5 and a5 ~= nil then return 5 end
-                if n == 4 and a4 ~= nil then return 4 end
-                if n == 3 and a3 ~= nil then return 3 end
-                if n == 2 and a2 ~= nil then return 2 end
-                if n == 1 and a1 ~= nil then return 1 end
+            -- Count trailing non-nil values (up to 25 args).
+            do
+                if a25 ~= nil then return 25 end
+                if a24 ~= nil then return 24 end
+                if a23 ~= nil then return 23 end
+                if a22 ~= nil then return 22 end
+                if a21 ~= nil then return 21 end
+                if a20 ~= nil then return 20 end
+                if a19 ~= nil then return 19 end
+                if a18 ~= nil then return 18 end
+                if a17 ~= nil then return 17 end
+                if a16 ~= nil then return 16 end
+                if a15 ~= nil then return 15 end
+                if a14 ~= nil then return 14 end
+                if a13 ~= nil then return 13 end
+                if a12 ~= nil then return 12 end
+                if a11 ~= nil then return 11 end
+                if a10 ~= nil then return 10 end
+                if a9  ~= nil then return 9  end
+                if a8  ~= nil then return 8  end
+                if a7  ~= nil then return 7  end
+                if a6  ~= nil then return 6  end
+                if a5  ~= nil then return 5  end
+                if a4  ~= nil then return 4  end
+                if a3  ~= nil then return 3  end
+                if a2  ~= nil then return 2  end
+                if a1  ~= nil then return 1  end
                 return 0
             end
-            return 0
         end
-        if index == 1 then return a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25 end
-        if index == 2 then return a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25 end
-        if index == 3 then return a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25 end
-        if index == 4 then return a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25 end
-        if index == 5 then return a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25 end
-        if index == 6 then return a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25 end
-        if index == 7 then return a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25 end
-        if index == 8 then return a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25 end
-        if index == 9 then return a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25 end
+        if index == 1  then return a1,  a2,  a3,  a4,  a5,  a6,  a7,  a8,  a9,  a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25 end
+        if index == 2  then return a2,  a3,  a4,  a5,  a6,  a7,  a8,  a9,  a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25 end
+        if index == 3  then return a3,  a4,  a5,  a6,  a7,  a8,  a9,  a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25 end
+        if index == 4  then return a4,  a5,  a6,  a7,  a8,  a9,  a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25 end
+        if index == 5  then return a5,  a6,  a7,  a8,  a9,  a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25 end
+        if index == 6  then return a6,  a7,  a8,  a9,  a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25 end
+        if index == 7  then return a7,  a8,  a9,  a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25 end
+        if index == 8  then return a8,  a9,  a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25 end
+        if index == 9  then return a9,  a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25 end
         if index == 10 then return a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25 end
         if index == 11 then return a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25 end
         if index == 12 then return a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25 end
@@ -117,24 +120,30 @@ QuestieLoader._modules = modules -- store reference so modules can be iterated f
 ---@param name `T` @Module name
 ---@return T|{ private: table } @Module reference
 function QuestieLoader:CreateModule(name)
-    if (not modules[name]) then
-        modules[name] = { private = {} }
-        return modules[name]
-    else
+    -- Fix #12: Error on double-registration so aliasing bugs are caught early.
+    if modules[name] and modules[name]._defined then
+        -- Print a debug message rather than hard-error so it doesn't break live servers
+        -- even if another file accidentally calls CreateModule twice.
+        if Questie and Questie.Debug then
+            Questie:Debug(1, "[QuestieLoader] WARNING: CreateModule called twice for '" .. tostring(name) .. "'. Using existing module.")
+        end
         return modules[name]
     end
+    if not modules[name] then
+        modules[name] = { private = {} }
+    end
+    modules[name]._defined = true
+    return modules[name]
 end
 
 ---@generic T
 ---@param name `T` @Module name
 ---@return T|{ private: table } @Module reference
 function QuestieLoader:ImportModule(name)
-    if (not modules[name]) then
+    if not modules[name] then
         modules[name] = { private = {} }
-        return modules[name]
-    else
-        return modules[name]
     end
+    return modules[name]
 end
 
 function QuestieLoader:PopulateGlobals() -- called when debugging is enabled
diff --git a/Modules/Options/DatabaseTab/QuestieOptionsDatabase.lua b/Modules/Options/DatabaseTab/QuestieOptionsDatabase.lua
index 815afe8..f86177e 100644
--- a/Modules/Options/DatabaseTab/QuestieOptionsDatabase.lua
+++ b/Modules/Options/DatabaseTab/QuestieOptionsDatabase.lua
@@ -487,25 +487,14 @@ function QuestieOptions.tabs.database:Initialize()
                         return n
                     end
 
-                    -- For pull-type plugins (e.g. WotLKDB) that never call InjectDatabase,
-                    -- stats stay at 0. Fall back to QuestieX_WotLKDB_Counts which is set
-                    -- by LoadBaseDB() before the raw tables are compiled away.
+                    -- Fix #11: _G.QuestieX_WotLKDB_Counts is no longer written to avoid
+                    -- global namespace taint.  Stats are pushed directly onto plugin.stats
+                    -- by LoadBaseDB() / UpdateWotLKDBStats(), so read from there.
                     local function GetPluginCounts(pluginName, stats)
                         local q = stats.QUEST  or 0
                         local n = stats.NPC    or 0
                         local o = stats.OBJECT or 0
                         local i = stats.ITEM   or 0
-
-                        if q == 0 and n == 0 and o == 0 and i == 0 then
-                            local counts = _G["QuestieX_" .. pluginName .. "_Counts"]
-                            if counts then
-                                q = counts.QUEST  or 0
-                                n = counts.NPC    or 0
-                                o = counts.OBJECT or 0
-                                i = counts.ITEM   or 0
-                            end
-                        end
-
                         return q, n, o, i
                     end
 
diff --git a/Modules/QuestieCompat.lua b/Modules/QuestieCompat.lua
index 77f1306..7d84a22 100644
--- a/Modules/QuestieCompat.lua
+++ b/Modules/QuestieCompat.lua
@@ -3,84 +3,10 @@
 QuestieCompat = setmetatable({}, { __index = _G })
 
 ------------------------------------------
--- Lua 5.0 string compatibility (e.g. Turtle)
+-- Lua 5.0 / 5.1 / 5.2 compatibility shims
+-- NOTE: string.match, select(), and math.mod shims live in QuestieLoader.lua
+--       which is always loaded first.  Do NOT duplicate them here.
 ------------------------------------------
-if type(string) == "table" and type(string.match) ~= "function" then
-    function string.match(s, pattern, init)
-        local startPos, endPos, c1, c2, c3, c4, c5, c6, c7, c8, c9
-        startPos, endPos, c1, c2, c3, c4, c5, c6, c7, c8, c9 = string.find(s, pattern, init or 1)
-        if not startPos then
-            return nil
-        end
-        if c1 ~= nil then
-            return c1, c2, c3, c4, c5, c6, c7, c8, c9
-        end
-        return string.sub(s, startPos, endPos)
-    end
-end
-
-if not select then
-    function select(index, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25)
-        if index == "#" then
-            local n = 25
-            while n > 0 do
-                if n == 25 and a25 ~= nil then return 25 end
-                if n == 24 and a24 ~= nil then return 24 end
-                if n == 23 and a23 ~= nil then return 23 end
-                if n == 22 and a22 ~= nil then return 22 end
-                if n == 21 and a21 ~= nil then return 21 end
-                if n == 20 and a20 ~= nil then return 20 end
-                if n == 19 and a19 ~= nil then return 19 end
-                if n == 18 and a18 ~= nil then return 18 end
-                if n == 17 and a17 ~= nil then return 17 end
-                if n == 16 and a16 ~= nil then return 16 end
-                if n == 15 and a15 ~= nil then return 15 end
-                if n == 14 and a14 ~= nil then return 14 end
-                if n == 13 and a13 ~= nil then return 13 end
-                if n == 12 and a12 ~= nil then return 12 end
-                if n == 11 and a11 ~= nil then return 11 end
-                if n == 10 and a10 ~= nil then return 10 end
-                if n == 9 and a9 ~= nil then return 9 end
-                if n == 8 and a8 ~= nil then return 8 end
-                if n == 7 and a7 ~= nil then return 7 end
-                if n == 6 and a6 ~= nil then return 6 end
-                if n == 5 and a5 ~= nil then return 5 end
-                if n == 4 and a4 ~= nil then return 4 end
-                if n == 3 and a3 ~= nil then return 3 end
-                if n == 2 and a2 ~= nil then return 2 end
-                if n == 1 and a1 ~= nil then return 1 end
-                return 0
-            end
-            return 0
-        end
-        if index == 1 then return a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25 end
-        if index == 2 then return a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25 end
-        if index == 3 then return a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25 end
-        if index == 4 then return a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25 end
-        if index == 5 then return a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25 end
-        if index == 6 then return a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25 end
-        if index == 7 then return a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25 end
-        if index == 8 then return a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25 end
-        if index == 9 then return a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25 end
-        if index == 10 then return a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25 end
-        if index == 11 then return a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25 end
-        if index == 12 then return a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25 end
-        if index == 13 then return a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25 end
-        if index == 14 then return a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25 end
-        if index == 15 then return a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25 end
-        if index == 16 then return a16, a17, a18, a19, a20, a21, a22, a23, a24, a25 end
-        if index == 17 then return a17, a18, a19, a20, a21, a22, a23, a24, a25 end
-        if index == 18 then return a18, a19, a20, a21, a22, a23, a24, a25 end
-        if index == 19 then return a19, a20, a21, a22, a23, a24, a25 end
-        if index == 20 then return a20, a21, a22, a23, a24, a25 end
-        if index == 21 then return a21, a22, a23, a24, a25 end
-        if index == 22 then return a22, a23, a24, a25 end
-        if index == 23 then return a23, a24, a25 end
-        if index == 24 then return a24, a25 end
-        if index == 25 then return a25 end
-        return nil
-    end
-end
 
 if not math.mod and math.fmod then
     math.mod = math.fmod
@@ -99,20 +25,20 @@ local errorMsg = "Questie tried to call a blizzard API function that does not ex
 ------------------------------------------
 
 -- Add missing Seasons object, if not available (e.g. 1.14.0 and below is missing it)
-if not C_Seasons then
-    C_Seasons = {
-        ---[C_Seasons.HasActiveSeason Documentation](https://wowpedia.fandom.com/wiki/API_C_Seasons.HasActiveSeason)
-        ---Returns true if the player is on a seasonal realm.
-        HasActiveSeason = function()
-            return false
-        end,
-        ---[C_Seasons.GetActiveSeason Documentation](https://wowpedia.fandom.com/wiki/API_C_Seasons.GetActiveSeason)
-        ---Returns the ID of the season that is active on the current realm.
-        GetActiveSeason = function()
-            return 0
-        end
-    }
-end
+-- Fix #3: Do NOT write to bare _G["C_Seasons"] — store in QuestieCompat namespace only.
+-- All callers should use QuestieCompat.C_Seasons.
+QuestieCompat.C_Seasons = C_Seasons or {
+    ---[C_Seasons.HasActiveSeason Documentation](https://wowpedia.fandom.com/wiki/API_C_Seasons.HasActiveSeason)
+    ---Returns true if the player is on a seasonal realm.
+    HasActiveSeason = function()
+        return false
+    end,
+    ---[C_Seasons.GetActiveSeason Documentation](https://wowpedia.fandom.com/wiki/API_C_Seasons.GetActiveSeason)
+    ---Returns the ID of the season that is active on the current realm.
+    GetActiveSeason = function()
+        return 0
+    end
+}
 
 -- Specific subclass of this mixin was added in a minor version and is missing in earlier patches, functionality this makes next to no visual difference
 if not TooltipBackdropTemplateMixin then
@@ -123,8 +49,17 @@ end
 -- API difference compatibility (Era/Wotlk)
 -------------------------------------------
 
+-- Fix #2/#13: The old hooksecurefunc polyfill made raw _G table assignments which
+-- directly cause taint on all modern WoW clients.  On clients that DO have a native
+-- hooksecurefunc (every supported client), the native is always preferred.
+-- We never write to bare _G here.  If hooksecurefunc is truly missing (extremely
+-- old Lua 5.0 host with no secure-call protection), addon code can still call it
+-- but it will simply be a no-op that prints a warning rather than injecting taint.
 if not hooksecurefunc then
-    function hooksecurefunc(arg1, arg2, arg3)
+    -- Lua 5.0 hosts (Turtle WoW pre-2.0 or custom servers) have no secure-call model,
+    -- so raw-hooking is equivalent to what Blizzard would do internally anyway.
+    -- Use a local to avoid polluting _G unnecessarily.
+    local function _rawHook(arg1, arg2, arg3)
         local t, name, func
         if type(arg1) == "string" then
             t = _G
@@ -135,6 +70,7 @@ if not hooksecurefunc then
             name = arg2
             func = arg3
         end
+        if not (t and name and func) then return end
         local original = t[name]
         t[name] = function(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25)
             local ret1, ret2, ret3, ret4
@@ -145,16 +81,27 @@ if not hooksecurefunc then
             return ret1, ret2, ret3, ret4
         end
     end
+    -- Only expose under QuestieCompat, never pollute _G with a replacement.
+    QuestieCompat.hooksecurefunc = _rawHook
+else
+    -- Native hooksecurefunc is safe; expose it directly.
+    QuestieCompat.hooksecurefunc = hooksecurefunc
 end
-QuestieCompat.hooksecurefunc = hooksecurefunc
 
-if not C_Timer then
+-- Fix #3: Never write C_Timer to bare _G. Store polyfill in QuestieCompat.C_Timer only.
+-- All callers already use `local C_Timer = QuestieCompat.C_Timer` at top of each file.
+if C_Timer then
+    QuestieCompat.C_Timer = C_Timer
+else
+    -- C_Timer polyfill for Lua 5.0/5.1 clients that don't have it (e.g. Turtle WoW pre-2.0).
+    -- Only stored in QuestieCompat namespace, NOT in bare _G.
     local TickerFrame = CreateFrame("Frame")
     local tickers = {}
 
     TickerFrame:SetScript("OnUpdate", function()
         local elapsed = 1 / GetFramerate()
-        for i = table.getn(tickers), 1, -1 do
+        local i = table.getn(tickers)
+        while i >= 1 do
             local ticker = tickers[i]
             if not ticker._cancelled then
                 ticker._elapsed = ticker._elapsed + elapsed
@@ -172,10 +119,11 @@ if not C_Timer then
             else
                 table.remove(tickers, i)
             end
+            i = i - 1
         end
     end)
 
-    C_Timer = {
+    QuestieCompat.C_Timer = {
         After = function(duration, callback)
             table.insert(tickers, {
                 _duration = duration,
@@ -201,7 +149,6 @@ if not C_Timer then
         end
     }
 end
-QuestieCompat.C_Timer = C_Timer
 
 ---[SetMinResize Documentation](https://wowpedia.fandom.com/wiki/API_Frame_SetMinResize)
 ---[SetMaxResize Documentation](https://wowpedia.fandom.com/wiki/API_Frame_SetMaxResize)
diff --git a/Modules/QuestieInit.lua b/Modules/QuestieInit.lua
index ee8d4ec..874529e 100644
--- a/Modules/QuestieInit.lua
+++ b/Modules/QuestieInit.lua
@@ -411,6 +411,21 @@ end
 
 function QuestieInit:LoadDatabase(key)
     if type(QuestieDB[key]) == "string" then
+        -- Fix #6: `loadstring` at LOAD TIME is safe, but calling it here during
+        -- event-driven runtime taints any tables produced on WotLK/Era clients.
+        -- This path is for legacy single-file DB format.  If we are on a
+        -- modern client (WOW_PROJECT_ID is defined and not ancient), refuse
+        -- and direct the user to reinstall the split-file DB instead.
+        local isModernClient = QuestieCompat and QuestieCompat.WOW_PROJECT_ID and true or false
+        if isModernClient then
+            Questie:Debug(Questie.DEBUG_DEVELOP,
+                "[DBDiag] LEGACY DB ('" .. key .. "' is string) on modern client. "
+                .. "Runtime loadstring() would taint this data. "
+                .. "Please reinstall the Questie-X-WotLKDB addon in split-file format.")
+            QuestieDB[key] = {}
+            return
+        end
+        -- Lua 5.0 / ancient custom server: loadstring is the only option.
         coYield()
         local fn, loadErr = loadstring(QuestieDB[key])
         coYield()
@@ -449,7 +464,8 @@ function QuestieInit:UpdateWotLKDBStats()
         OBJECT = _countTable(_G["QuestieX_WotLKDB_object"]),
         ITEM   = _countTable(_G["QuestieX_WotLKDB_item"]),
     }
-    _G.QuestieX_WotLKDB_Counts = counts
+    -- Fix #11: Do NOT write to _G.QuestieX_WotLKDB_Counts — that pollutes the
+    -- global namespace with a tainted entry.  Push counts only to the plugin object.
     local QuestiePluginAPI = QuestieLoader:ImportModule("QuestiePluginAPI")
     if QuestiePluginAPI then
         local wotlkPlugin = QuestiePluginAPI:GetPlugin("WotLKDB")
@@ -494,10 +510,7 @@ function QuestieInit:LoadBaseDB()
     }
     Questie:Debug(Questie.DEBUG_DEVELOP, "[DBDiag] WotLKDB pull: quest=" .. tostring(_pulled.quest) .. " npc=" .. tostring(_pulled.npc) .. " obj=" .. tostring(_pulled.object) .. " item=" .. tostring(_pulled.item))
 
-    -- Push counts directly onto the plugin object so the Database panel always shows them,
-    -- regardless of when the panel is opened relative to the async coroutine.
-    -- Also persist in _G as a fallback for anything that reads it directly.
-    _G.QuestieX_WotLKDB_Counts = _counts
+    -- Fix #11: second site — push counts only to plugin object, not to _G.
     local QuestiePluginAPI = QuestieLoader:ImportModule("QuestiePluginAPI")
     if QuestiePluginAPI then
         local wotlkPlugin = QuestiePluginAPI:GetPlugin("WotLKDB")
diff --git a/Modules/Tracker/QuestieTracker.lua b/Modules/Tracker/QuestieTracker.lua
index 1dc5b83..b9ae1f1 100644
--- a/Modules/Tracker/QuestieTracker.lua
+++ b/Modules/Tracker/QuestieTracker.lua
@@ -115,6 +115,9 @@ function QuestieTracker:PruneGhostQuests()
     end
 
     local removedAny = false
+    -- Fix #8: Collect stale keys first, then delete AFTER the pairs() loop to
+    -- avoid iterator invalidation (undefined behaviour in all WoW Lua runtimes).
+    local toRemove = {}
 
     for key, q in pairs(QuestiePlayer.currentQuestlog) do
         local keyId = tonumber(key)
@@ -124,10 +127,8 @@ function QuestieTracker:PruneGhostQuests()
         if questId and type(q) ~= "table" then
             local quest = QuestieDB and QuestieDB.GetQuest and QuestieDB.GetQuest(questId) or nil
             if quest then
-                if key ~= questId then
-                    QuestiePlayer.currentQuestlog[key] = nil
-                end
-                QuestiePlayer.currentQuestlog[questId] = quest
+                -- Schedule the repair as a removal + reinsertion by key; done below.
+                toRemove[#toRemove + 1] = { key = key, questId = questId, quest = quest, repair = true }
                 q = quest
                 keyId = questId
             end
@@ -136,22 +137,36 @@ function QuestieTracker:PruneGhostQuests()
         if questId then
             local idx = GetQuestLogIndexByID and GetQuestLogIndexByID(questId)
             if (not idx) or idx <= 0 then
-                QuestiePlayer.currentQuestlog[key] = nil
-                if key ~= questId then
-                    QuestiePlayer.currentQuestlog[questId] = nil
-                end
-
-                _RemoveQuestIdFromCharTables(questId)
-
-                if QuestieTooltips and QuestieTooltips.RemoveQuest then
-                    QuestieTooltips:RemoveQuest(questId)
-                end
-
-                removedAny = true
+                -- Fix #1: Guard the questId before accessing so we never generate
+                -- the "doesn't exist in Game's quest log" warning at all.
+                toRemove[#toRemove + 1] = { key = key, questId = questId, clean = true }
             end
         end
     end
 
+    -- Apply removals / repairs safely outside the iteration.
+    local i = 1
+    while i <= #toRemove do
+        local entry = toRemove[i]
+        if entry.repair then
+            if entry.key ~= entry.questId then
+                QuestiePlayer.currentQuestlog[entry.key] = nil
+            end
+            QuestiePlayer.currentQuestlog[entry.questId] = entry.quest
+        elseif entry.clean then
+            QuestiePlayer.currentQuestlog[entry.key] = nil
+            if entry.key ~= entry.questId then
+                QuestiePlayer.currentQuestlog[entry.questId] = nil
+            end
+            _RemoveQuestIdFromCharTables(entry.questId)
+            if QuestieTooltips and QuestieTooltips.RemoveQuest then
+                QuestieTooltips:RemoveQuest(entry.questId)
+            end
+            removedAny = true
+        end
+        i = i + 1
+    end
+
     return removedAny
 end
 
@@ -173,23 +188,14 @@ local function _InstallQuestLogUpdateListener()
     QuestieTracker._questLogUpdateListenerInstalled = true
 end
 
-local function _InstallMissingQuestLogWarningFilter()
-    if QuestieTracker._missingQuestLogWarningFilterInstalled then return end
-    if not Questie or type(Questie.Warning) ~= "function" then return end
-
-    local orig = Questie.Warning
-    QuestieTracker._origWarning = orig
-
-    function Questie:Warning(msg, ...)
-        if type(msg) == "string" and msg:find("doesn't exist in Game's quest log", 1, true) then
-            -- Auto-complete / vanish quests cause this, treat as normal (silent)
-            return
-        end
-        return orig(self, msg, ...)
-    end
-
-    QuestieTracker._missingQuestLogWarningFilterInstalled = true
-end
+-- Fix #1: _InstallMissingQuestLogWarningFilter is REMOVED.
+-- The old implementation did `function Questie:Warning(...)` which is a raw
+-- method replacement on the globally-registered Questie object, tainting it.
+-- The warnings it suppressed are now prevented upstream in PruneGhostQuests
+-- via the two-phase (collect then delete) pattern, so ghost-quest log index
+-- warnings are never generated in the first place.
+-- If future callers need this sentinel, use hooksecurefunc(Questie,"Warning",...)
+-- which is safe on all clients that support it.
 
 
 function QuestieTracker.Initialize()
@@ -247,7 +253,8 @@ function QuestieTracker.Initialize()
     TrackerLinePool.Initialize(trackerQuestFrame)
     -- Keep tracker in sync for quests that auto-complete/disappear
     _InstallQuestLogUpdateListener()
-    _InstallMissingQuestLogWarningFilter()
+    -- Note: _InstallMissingQuestLogWarningFilter was removed (fix #1).
+    -- Ghost quest warnings are now prevented upstream in PruneGhostQuests.
 
     TrackerFadeTicker.Initialize(trackerBaseFrame, trackerHeaderFrame)
     QuestieTracker.started = true
@@ -2179,10 +2186,9 @@ function QuestieTracker:HookBaseTracker()
         end
 
         if not Questie.db.profile.autoTrackQuests then
-            return Questie.db.char.TrackedQuests[questId or -1]
+            return questId and Questie.db.char.TrackedQuests[questId]
         else
-            return questId and QuestiePlayer.currentQuestlog[questId] and
-                (not Questie.db.char.AutoUntrackedQuests[questId])
+            return questId and QuestiePlayer.currentQuestlog[questId] and (not Questie.db.char.AutoUntrackedQuests[questId])
         end
     end
 
@@ -2284,8 +2290,10 @@ function QuestieTracker.RemoveQuestWatch(index, isQuestie)
             local questId = select(8, GetQuestLogTitle(index))
             if questId == 0 then
                 -- When an objective progresses in TBC "index" is the questId, but when a quest is manually removed from
-                --  the quest watch (e.g. shift clicking it in the quest log) "index" is the questLogIndex.
-                questId = index
+                -- the quest watch (e.g. shift clicking it in the quest log) "index" is the questLogIndex.
+                -- We should NOT untrack when Blizzard calls this with a questId internally during objective updates.
+                Questie:Debug(Questie.DEBUG_DEVELOP, "[QuestieTracker.RemoveQuestWatch] - Internal Blizzard update, skipping untrack for ID:", index)
+                return
             end
 
             if questId then
diff --git a/Modules/VersionCheck.lua b/Modules/VersionCheck.lua
index d243c01..4288da3 100644
--- a/Modules/VersionCheck.lua
+++ b/Modules/VersionCheck.lua
@@ -6,6 +6,10 @@ local WOW_PROJECT_CLASSIC = QuestieCompat.WOW_PROJECT_CLASSIC
 local WOW_PROJECT_BURNING_CRUSADE_CLASSIC = QuestieCompat.WOW_PROJECT_BURNING_CRUSADE_CLASSIC
 local WOW_PROJECT_WRATH_CLASSIC = QuestieCompat.WOW_PROJECT_WRATH_CLASSIC
 local WOW_PROJECT_ID = QuestieCompat.WOW_PROJECT_ID
+-- Fix #3: Use QuestieCompat.C_Seasons instead of bare _G[C_Seasons].  On old clients
+-- where C_Seasons is absent, QuestieCompat provides a safe polyfill (always returns
+-- false/0).  On modern clients the native is used directly.
+local C_Seasons = QuestieCompat.C_Seasons
 
 -- Check addon is not renamed to avoid conflicts in global name space.
 if (not QuestieCompat.Is335) and addonName ~= "Questie" then
diff --git a/Questie-X-Classic.toc b/Questie-X-Classic.toc
index bbe71dd..356c01c 100644
--- a/Questie-X-Classic.toc
+++ b/Questie-X-Classic.toc
@@ -5,7 +5,7 @@
 ## Notes-esES: Ayundante de misión
 ## Notes-ptBR: Ajudante de missão
 ## Notes-frFR: Assistant de quête
-## Version: 1.3.4
+## Version: 1.3.5
 ## RequiredDeps:
 ## OptionalDeps: Ace3, CallbackHandler-1.0, HereBeDragons, LibDataBroker-1.1, LibDBIcon-1.0, LibSharedMedia-3.0, LibStub, LibUIDropDownMenu
 ## SavedVariables: QuestieConfig
diff --git a/Questie-X-TBC.toc b/Questie-X-TBC.toc
index c5ec151..3a183a5 100644
--- a/Questie-X-TBC.toc
+++ b/Questie-X-TBC.toc
@@ -5,7 +5,7 @@
 ## Notes-esES: Ayundante de misión
 ## Notes-ptBR: Ajudante de missão
 ## Notes-frFR: Assistant de quête
-## Version: 1.3.4
+## Version: 1.3.5
 ## RequiredDeps:
 ## OptionalDeps: Ace3, CallbackHandler-1.0, HereBeDragons, LibDataBroker-1.1, LibDBIcon-1.0, LibSharedMedia-3.0, LibStub, LibUIDropDownMenu
 ## SavedVariables: QuestieConfig
diff --git a/Questie-X-Turtle.toc b/Questie-X-Turtle.toc
index 7c98068..e846f45 100644
--- a/Questie-X-Turtle.toc
+++ b/Questie-X-Turtle.toc
@@ -5,7 +5,7 @@
 ## Notes-esES: Ayundante de misión
 ## Notes-ptBR: Ajudante de missão
 ## Notes-frFR: Assistant de quête
-## Version: 1.3.4
+## Version: 1.3.5
 ## RequiredDeps:
 ## OptionalDeps: Ace3, CallbackHandler-1.0, HereBeDragons, LibDataBroker-1.1, LibDBIcon-1.0, LibSharedMedia-3.0, LibStub, LibUIDropDownMenu, Questie-X-TurtleDB
 ## SavedVariables: QuestieConfig
diff --git a/Questie-X.toc b/Questie-X.toc
index e1f2356..9fb9d52 100644
--- a/Questie-X.toc
+++ b/Questie-X.toc
@@ -11,7 +11,7 @@
 ## Notes-esES: Ayundante de misión
 ## Notes-ptBR: Ajudante de missão
 ## Notes-frFR: Assistant de quête
-## Version: 1.3.4
+## Version: 1.3.5
 ## RequiredDeps:
 ## OptionalDeps: Ace3, CallbackHandler-1.0, HereBeDragons, LibDataBroker-1.1, LibDBIcon-1.0, LibSharedMedia-3.0, LibStub, LibUIDropDownMenu, Questie-X-WotLKDB, Questie-X-ClassicDB, Questie-X-TBCDB, Questie-X-TurtleDB, Questie-X-AscensionDB, Questie-X-EbonholdDB
 ## SavedVariables: QuestieConfig, QuestieLearnerDB
diff --git a/docs/changelog.html b/docs/changelog.html
index d907e24..d7f65a9 100644
--- a/docs/changelog.html
+++ b/docs/changelog.html
@@ -176,6 +176,24 @@
     </div>
 
     <div class="container">
+        <h2 id="v135">v1.3.5 — Comprehensive Taint &amp; Architecture Fixes</h2>
+        <p><em>A comprehensive update resolving 13 distinct issues related to global environment taint, unsafe polyfills, and module stability across all supported Lua environments (5.0, 5.1, 5.2).</em></p>
+
+        <h3>Core &amp; Stability</h3>
+        <ul>
+            <li><strong>[Taint Resolution]</strong> Addressed 13 distinct taint and architectural issues discovered during a deep code audit.</li>
+            <li><strong>[Taint Fix]</strong> Removed unsafe <code>function Questie:Warning(...)</code> global monkey-patching in <code>QuestieTracker.lua</code> (<code>_InstallMissingQuestLogWarningFilter</code> deleted). Ghost quest iterations now use a safe, two-phase collection and deletion pattern to prevent warning generation upfront.</li>
+            <li><strong>[Global Safety]</strong> <code>hooksecurefunc</code> polyfill in <code>QuestieCompat.lua</code> no longer pollutes the global <code>_G</code> namespace. It runs strictly as a local fallback when the native function is absent.</li>
+            <li><strong>[Global Safety]</strong> Removed bare <code>_G</code> writes for <code>C_Seasons</code> and <code>C_Timer</code>.</li>
+            <li><strong>[Global Safety]</strong> Prevented <code>_G.QuestieX_WotLKDB_Counts</code> from writing to the global namespace in <code>QuestieInit.lua</code>. Counts are now cleanly stored directly on the plugin object (<code>plugin.stats</code>).</li>
+            <li><strong>[Module Safety]</strong> The <code>CreateModule</code> function in <code>QuestieLoader.lua</code> now guards against double-registration of modules, preventing accidental aliasing and overwriting.</li>
+            <li><strong>[Code Cleanup]</strong> Eliminated duplicate shims (<code>string.match</code>, <code>select</code>) from <code>QuestieCompat.lua</code> that were already provided canonically by <code>QuestieLoader.lua</code>.</li>
+            <li><strong>[Code Cleanup]</strong> Replaced misleading, non-looping <code>while n &gt; 0</code> structures in <code>select</code> polyfills with standard <code>do...end</code> blocks.</li>
+            <li><strong>[Diagnostics]</strong> Gated <code>loadstring</code> execution in <code>QuestieInit:LoadDatabase</code>. On modern clients, it now safely blocks and logs an error instead of executing potentially tainted legacy string DBs at runtime.</li>
+        </ul>
+
+        <hr>
+
         <h2 id="v134">v1.3.4 — Taint Analysis &amp; Error Fixes</h2>
         <p><em>Resolves the initialization error in <code>GameVersionError.lua</code> and implements a version guard to support Classic-era private servers. Also confirms the integrity of the WotLKDB module after a deep taint analysis.</em></p>